diff --git a/.gitignore b/.gitignore
index f5e869449..aa384b25a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,6 +49,7 @@ __pycache__/
 *.py[cod]
 .env
 .python-version
+.ipynb_checkpoints/
 
 # pyenv #
 #########
diff --git a/src/troute-nwm/src/nwm_routing/preprocess.py b/src/troute-nwm/src/nwm_routing/preprocess.py
index 4891ae01d..2526a7d17 100644
--- a/src/troute-nwm/src/nwm_routing/preprocess.py
+++ b/src/troute-nwm/src/nwm_routing/preprocess.py
@@ -293,6 +293,7 @@ def nwm_network_preprocess(
             _, reaches, rconn_diff = nnu.organize_independent_networks(
                 diffusive_network_data[tw]['connections'],
                 set(trib_segs),
+                set(),
             )
             diffusive_network_data[tw]['rconn'] = rconn_diff
             diffusive_network_data[tw]['reaches'] = reaches[tw]